Summary
High-mu twin triode. Designed for use in high frequency circuits. Also known as ECC81.
This valve was intended for use as a grounded grid amplifier at frequencies up to about 200 MHz and data useful for designing such circuits were provided. It was however used in many different ways in circuits requiring a pair of triodes with good RF characteristics. As of 2010, they are still manufactured in China.
Manufacturer: Standard Telephones & Cables Ltd., Footscray, Sidcup, Kent, UK. The base of the valve has 'Brimar' inscribed on it. Brimar was the brand name used by STC for radio receiving type valves.
6.3/12.6 V indirectly heated cathode.
Physical Description
Tubular bulb with 9 pin miniature base.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Transfer from Science Museum of Victoria (SMV), 01 Aug 1971
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Manufacturer
Standard Telephones & Cables Ltd (S.T.C.), Footscray, Sidcup, Kent, England, Great Britain, 1960-1969
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Inscriptions
Bulb: Brimar/BVA/12AT7/Made in England/5L1
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Brand Names
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Classification
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Category
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Discipline
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Type of item
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Exhibition Collection Management
20 mm (Length), 20 mm (Width), 55 mm (Height)
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overall dimensions
54 mm (Length), 20 mm (Outside Diameter)
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Keywords